Union Drilling, Inc. provides contract land drilling services and equipment primarily to natural gas producers in the United States. Its principal operations are located in the Appalachian Basin, extending from New York to Tennessee; the Arkoma Basin in eastern Oklahoma and Arkansas, including the Fayetteville Shale; and the Fort Worth Basin in northern Texas. The company’s rigs operate in unconventional natural gas producing areas, where specialized drilling techniques are required to develop unconventional natural gas resources. In addition, it provides the drilling crews and the ancillary equipment to operate its drilling rigs. As of March 12, 2007, Union Drilling owned 76 rigs....